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Cold resistance depends on acclimation and behavioral caste in a temperate ant
Andreas P Modlmeier1, Tobias Pamminger, Susanne Foitzik
1Institute of Zoology, Johannes Gutenberg University of Mainz, Johannes von Müller Weg 6, 5099, Mainz, Germany. modlmeie@uni-mainz.de
Die Naturwissenschaften
|September 8, 2012
Summary
Ant workers adjust to cold temperatures, with acclimation enhancing survival. Exterior workers show better cold tolerance than interior workers, suggesting physiological adaptations are key.
Area of Science:
- Zoology
- Ecology
- Animal Physiology
Background:
- Organisms in cold climates must adapt to low temperatures.
- Acclimation plays a crucial role in enhancing cold tolerance.
Purpose of the Study:
- Investigate chill-coma recovery time in temperate ants (Temnothorax nylanderi).
- Examine the effects of cold and heat acclimation on cold tolerance.
- Compare cold tolerance across different worker castes.
Main Methods:
- Collected ant colonies in autumn and spring from Germany.
- Experimentally acclimated ants to cold and warm temperatures.
- Measured chill-coma recovery time in different worker castes.
Main Results:
- Cold-acclimated ants recovered faster from cold exposure.
- Heat acclimation did not negate cold acclimation benefits.
- Spring colonies exhibited similar cold tolerance to lab-acclimated ants.
- Exterior workers recovered faster than interior workers.
- No link found between activity level and cold tolerance in workers.
Conclusions:
- Acclimation is vital for cold tolerance in ants under natural and lab conditions.
- Physiological differences, not behavior, likely explain enhanced cold tolerance in exterior workers.
- Monomorphic behavioral castes exhibit variations in cold tolerance and body dimensions.
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